package com.example.crm.web.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.PrintWriter;

public class AuthorizationFilter  implements Filter{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void destroy() {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest HttpRequest=(HttpServletRequest) request;
        HttpServletResponse httpResponse=(HttpServletResponse) response;
        if(HttpRequest.getSession().getAttribute("loginUser")==null){
            httpResponse.setContentType("text/html;charset=utf-8");
            PrintWriter out=httpResponse.getWriter();
            out.print("<script>alert('请先登录,在进行后续操作');location.href='"+HttpRequest.getContextPath()+"/login.jsp'</script>");
        }else {
            chain.doFilter(HttpRequest,httpResponse);
        }
    }
}
